Comment Re:One mistake Sony Made (Score 1) 172
Most of the points you've mentioned aren't really relevant.
PDF created for A4/Letter page format was hard to read on a 6" screen? That's hardly surprising is it?
As far as "re-flow" of PDFs goes (PDF is more of a set of instructions for the printer, than book format), Sony had the most advanced viewer, actually developed by Adobe.
Notes/bookmarks - T1,T2,T3 are Android based, so choose your poison, for older versions there were various projects improving things.